/*  $NetBSD: nameser.h,v 1.25 2009/04/12 17:07:34 christos Exp $    */

/*
 * Portions Copyright (C) 2004, 2005, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
 * Portions Copyright (C) 1996-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Copyright (c) 1983, 1989, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 *  Id: nameser.h,v 1.16 2009/03/03 01:52:48 each Exp
 */

#ifndef _ARPA_NAMESER_H_
#define _ARPA_NAMESER_H_

#define BIND_4_COMPAT

#include <sys/types.h>
#include <sys/cdefs.h>

/*
 * Revision information.  This is the release date in YYYYMMDD format.
 * It can change every day so the right thing to do with it is use it
 * in preprocessor commands such as "#if (__NAMESER > 19931104)".  Do not
 * compare for equality; rather, use it to determine whether your libbind.a
 * contains a new enough lib/nameser/ to support the feature you need.
 */

#define __NAMESER   20090302    /*%< New interface version stamp. */

/*
 * Define constants based on RFC0883, RFC1034, RFC 1035
 */
#define NS_PACKETSZ 512 /* default UDP packet size */
#define NS_MAXDNAME 1025    /* maximum domain name (presentation format)*/
#define NS_MAXMSG   65535   /* maximum message size */
#define NS_MAXCDNAME    255 /* maximum compressed domain name */
#define NS_MAXLABEL 63  /* maximum length of domain label */
#define NS_MAXLABELS    128 /* theoretical max #/labels per domain name */
#define NS_MAXNNAME 256 /* maximum uncompressed (binary) domain name*/
#define NS_MAXPADDR (sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
#define NS_HFIXEDSZ 12  /* #/bytes of fixed data in header */
#define NS_QFIXEDSZ 4   /* #/bytes of fixed data in query */
#define NS_RRFIXEDSZ    10  /* #/bytes of fixed data in r record */
#define NS_INT32SZ  4   /* #/bytes of data in a uint32_t */
#define NS_INT16SZ  2   /* #/bytes of data in a uint16_t */
#define NS_INT8SZ   1   /* #/bytes of data in a uint8_t */
#define NS_INADDRSZ 4   /* IPv4 T_A */
#define NS_IN6ADDRSZ    16  /* IPv6 T_AAAA */
#define NS_CMPRSFLGS    0xc0    /* Flag bits indicating name compression. */
#define NS_DEFAULTPORT  53  /* For both TCP and UDP. */

/*
 * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
 * in synch with it.
 */
typedef enum __ns_sect {
    ns_s_qd = 0,        /* Query: Question. */
    ns_s_zn = 0,        /* Update: Zone. */
    ns_s_an = 1,        /* Query: Answer. */
    ns_s_pr = 1,        /* Update: Prerequisites. */
    ns_s_ns = 2,        /* Query: Name servers. */
    ns_s_ud = 2,        /* Update: Update. */
    ns_s_ar = 3,        /* Query|Update: Additional records. */
    ns_s_max = 4
} ns_sect;

/*
 * Network name (compressed or not) type.  Equivilent to a pointer when used
 * in a function prototype.  Can be const'd.
 */
typedef u_char ns_nname[NS_MAXNNAME];
typedef const u_char *ns_nname_ct;
typedef u_char *ns_nname_t;

struct ns_namemap { ns_nname_ct base; int len; };
typedef struct ns_namemap *ns_namemap_t;
typedef const struct ns_namemap *ns_namemap_ct;

/*
 * This is a message handle.  It is caller allocated and has no dynamic data.
 * This structure is intended to be opaque to all but ns_parse.c, thus the
 * leading _'s on the member names.  Use the accessor functions, not the _'s.
 */
typedef struct __ns_msg {
    const u_char    *_msg, *_eom;
    uint16_t    _id, _flags, _counts[ns_s_max];
    const u_char    *_sections[ns_s_max];
    ns_sect     _sect;
    int     _rrnum;
    const u_char    *_msg_ptr;
} ns_msg;
/*
 * This is a newmsg handle, used when constructing new messages with
 * ns_newmsg_init, et al.
 */
struct ns_newmsg {
    ns_msg      msg;
    const u_char    *dnptrs[25];
    const u_char    **lastdnptr;
};
typedef struct ns_newmsg ns_newmsg;

/* Private data structure - do not use from outside library. */
struct _ns_flagdata {  int mask, shift;  };
extern const struct _ns_flagdata _ns_flagdata[];

/* Accessor macros - this is part of the public interface. */

#define ns_msg_id(handle) ((handle)._id + 0)
#define ns_msg_base(handle) ((handle)._msg + 0)
#define ns_msg_end(handle) ((handle)._eom + 0)
#define ns_msg_size(handle) ((size_t)((handle)._eom - (handle)._msg))
#define ns_msg_count(handle, section) ((handle)._counts[section] + 0)

/*
 * This is a parsed record.  It is caller allocated and has no dynamic data.
 */
typedef struct __ns_rr {
    char        name[NS_MAXDNAME];
    uint16_t    type;
    uint16_t    rr_class;
    uint32_t    ttl;
    uint16_t    rdlength;
    const u_char *  rdata;
} ns_rr;

/*
 * Same thing, but using uncompressed network binary names, and real C types.
 */
typedef struct __ns_rr2 {
    ns_nname    nname;
    size_t      nnamel;
    int     type;
    int     rr_class;
    u_int       ttl;
    int     rdlength;
    const u_char *  rdata;
} ns_rr2;
/* Accessor macros - this is part of the public interface. */
#define ns_rr_name(rr)  (((rr).name[0] != '\0') ? (rr).name : ".")
#define ns_rr_nname(rr) ((const ns_nname_t)(rr).nname)
#define ns_rr_nnamel(rr) ((rr).nnamel + 0)
#define ns_rr_type(rr)  ((ns_type)((rr).type + 0))
#define ns_rr_class(rr) ((ns_class)((rr).rr_class + 0))
#define ns_rr_ttl(rr)   ((u_long)(rr).ttl + 0)
#define ns_rr_rdlen(rr) ((size_t)(rr).rdlength + 0)
#define ns_rr_rdata(rr) ((rr).rdata + 0)

/*
 * These don't have to be in the same order as in the packet flags word,
 * and they can even overlap in some cases, but they will need to be kept
 * in synch with ns_parse.c:ns_flagdata[].
 */
typedef enum __ns_flag {
    ns_f_qr,        /* Question/Response. */
    ns_f_opcode,        /* Operation code. */
    ns_f_aa,        /* Authoritative Answer. */
    ns_f_tc,        /* Truncation occurred. */
    ns_f_rd,        /* Recursion Desired. */
    ns_f_ra,        /* Recursion Available. */
    ns_f_z,         /* MBZ. */
    ns_f_ad,        /* Authentic Data (DNSSEC). */
    ns_f_cd,        /* Checking Disabled (DNSSEC). */
    ns_f_rcode,     /* Response code. */
    ns_f_max
} ns_flag;

/*
 * Currently defined opcodes.
 */
typedef enum __ns_opcode {
    ns_o_query = 0,     /* Standard query. */
    ns_o_iquery = 1,    /* Inverse query (deprecated/unsupported). */
    ns_o_status = 2,    /* Name server status query (unsupported). */
                /* Opcode 3 is undefined/reserved. */
    ns_o_notify = 4,    /* Zone change notification. */
    ns_o_update = 5,    /* Zone update message. */
    ns_o_max = 6
} ns_opcode;

/*
 * Currently defined response codes.
 */
typedef enum __ns_rcode {
    ns_r_noerror = 0,   /* No error occurred. */
    ns_r_formerr = 1,   /* Format error. */
    ns_r_servfail = 2,  /* Server failure. */
    ns_r_nxdomain = 3,  /* Name error. */
    ns_r_notimpl = 4,   /* Unimplemented. */
    ns_r_refused = 5,   /* Operation refused. */
    /* these are for BIND_UPDATE */
    ns_r_yxdomain = 6,  /* Name exists */
    ns_r_yxrrset = 7,   /* RRset exists */
    ns_r_nxrrset = 8,   /* RRset does not exist */
    ns_r_notauth = 9,   /* Not authoritative for zone */
    ns_r_notzone = 10,  /* Zone of record different from zone section */
    ns_r_max = 11,
    /* The following are EDNS extended rcodes */
    ns_r_badvers = 16,
    /* The following are TSIG errors */
    ns_r_badsig = 16,
    ns_r_badkey = 17,
    ns_r_badtime = 18
} ns_rcode;

/* BIND_UPDATE */
typedef enum __ns_update_operation {
    ns_uop_delete = 0,
    ns_uop_add = 1,
    ns_uop_max = 2
} ns_update_operation;

/*
 * This structure is used for TSIG authenticated messages
 */
struct ns_tsig_key {
        char name[NS_MAXDNAME], alg[NS_MAXDNAME];
        unsigned char *data;
        int len;
};
typedef struct ns_tsig_key ns_tsig_key;

/*
 * This structure is used for TSIG authenticated TCP messages
 */
struct ns_tcp_tsig_state {
    int counter;
    struct dst_key *key;
    void *ctx;
    unsigned char sig[NS_PACKETSZ];
    int siglen;
};
typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;

#define NS_TSIG_FUDGE 300
#define NS_TSIG_TCP_COUNT 100
#define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"

#define NS_TSIG_ERROR_NO_TSIG -10
#define NS_TSIG_ERROR_NO_SPACE -11
#define NS_TSIG_ERROR_FORMERR -12

/*
 * Currently defined type values for resources and queries.
 */
typedef enum __ns_type {
    ns_t_invalid = 0,   /* Cookie. */
    ns_t_a = 1,     /* Host address. */
    ns_t_ns = 2,        /* Authoritative server. */
    ns_t_md = 3,        /* Mail destination. */
    ns_t_mf = 4,        /* Mail forwarder. */
    ns_t_cname = 5,     /* Canonical name. */
    ns_t_soa = 6,       /* Start of authority zone. */
    ns_t_mb = 7,        /* Mailbox domain name. */
    ns_t_mg = 8,        /* Mail group member. */
    ns_t_mr = 9,        /* Mail rename name. */
    ns_t_null = 10,     /* Null resource record. */
    ns_t_wks = 11,      /* Well known service. */
    ns_t_ptr = 12,      /* Domain name pointer. */
    ns_t_hinfo = 13,    /* Host information. */
    ns_t_minfo = 14,    /* Mailbox information. */
    ns_t_mx = 15,       /* Mail routing information. */
    ns_t_txt = 16,      /* Text strings. */
    ns_t_rp = 17,       /* Responsible person. */
    ns_t_afsdb = 18,    /* AFS cell database. */
    ns_t_x25 = 19,      /* X_25 calling address. */
    ns_t_isdn = 20,     /* ISDN calling address. */
    ns_t_rt = 21,       /* Router. */
    ns_t_nsap = 22,     /* NSAP address. */
    ns_t_nsap_ptr = 23, /* Reverse NSAP lookup (deprecated). */
    ns_t_sig = 24,      /* Security signature. */
    ns_t_key = 25,      /* Security key. */
    ns_t_px = 26,       /* X.400 mail mapping. */
    ns_t_gpos = 27,     /* Geographical position (withdrawn). */
    ns_t_aaaa = 28,     /* IPv6 Address. */
    ns_t_loc = 29,      /* Location Information. */
    ns_t_nxt = 30,      /* Next domain (security). */
    ns_t_eid = 31,      /* Endpoint identifier. */
    ns_t_nimloc = 32,   /* Nimrod Locator. */
    ns_t_srv = 33,      /* Server Selection. */
    ns_t_atma = 34,     /* ATM Address */
    ns_t_naptr = 35,    /* Naming Authority PoinTeR */
    ns_t_kx = 36,       /* Key Exchange */
    ns_t_cert = 37,     /* Certification record */
    ns_t_a6 = 38,       /* IPv6 address (experimental) */
    ns_t_dname = 39,    /* Non-terminal DNAME */
    ns_t_sink = 40,     /* Kitchen sink (experimentatl) */
    ns_t_opt = 41,      /* EDNS0 option (meta-RR) */
    ns_t_apl = 42,      /* Address prefix list (RFC 3123) */
    ns_t_ds = 43,       /* Delegation Signer */
    ns_t_sshfp = 44,    /* SSH Fingerprint */
    ns_t_ipseckey = 45, /* IPSEC Key */
    ns_t_rrsig = 46,    /* RRset Signature */
    ns_t_nsec = 47,     /* Negative security */
    ns_t_dnskey = 48,   /* DNS Key */
    ns_t_dhcid = 49,    /* Dynamic host configuratin identifier */
    ns_t_nsec3 = 50,    /* Negative security type 3 */
    ns_t_nsec3param = 51,   /* Negative security type 3 parameters */
    ns_t_hip = 55,      /* Host Identity Protocol */
    ns_t_spf = 99,      /* Sender Policy Framework */
    ns_t_tkey = 249,    /* Transaction key */
    ns_t_tsig = 250,    /* Transaction signature. */
    ns_t_ixfr = 251,    /* Incremental zone transfer. */
    ns_t_axfr = 252,    /* Transfer zone of authority. */
    ns_t_mailb = 253,   /* Transfer mailbox records. */
    ns_t_maila = 254,   /* Transfer mail agent records. */
    ns_t_any = 255,     /* Wildcard match. */
    ns_t_zxfr = 256,    /* BIND-specific, nonstandard. */
    ns_t_dlv = 32769,   /* DNSSEC look-aside validatation. */
    ns_t_max = 65536
} ns_type;

/* Exclusively a QTYPE? (not also an RTYPE) */
#define ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
              (t) == ns_t_mailb || (t) == ns_t_maila)
/* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
#define ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
/* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
#define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
#define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
#define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
               (t) == ns_t_zxfr)

/*
 * Values for class field
 */
typedef enum __ns_class {
    ns_c_invalid = 0,   /* Cookie. */
    ns_c_in = 1,        /* Internet. */
    ns_c_2 = 2,     /* unallocated/unsupported. */
    ns_c_chaos = 3,     /* MIT Chaos-net. */
    ns_c_hs = 4,        /* MIT Hesiod. */
    /* Query class values which do not appear in resource records */
    ns_c_none = 254,    /* for prereq. sections in update requests */
    ns_c_any = 255,     /* Wildcard match. */
    ns_c_max = 65536
} ns_class;

/* DNSSEC constants. */

typedef enum __ns_key_types {
    ns_kt_rsa = 1,      /* key type RSA/MD5 */
    ns_kt_dh  = 2,      /* Diffie Hellman */
    ns_kt_dsa = 3,      /* Digital Signature Standard (MANDATORY) */
    ns_kt_private = 254 /* Private key type starts with OID */
} ns_key_types;

typedef enum __ns_cert_types {
    cert_t_pkix = 1,    /* PKIX (X.509v3) */
    cert_t_spki = 2,    /* SPKI */
    cert_t_pgp  = 3,    /* PGP */
    cert_t_url  = 253,  /* URL private type */
    cert_t_oid  = 254   /* OID private type */
} ns_cert_types;

/* Flags field of the KEY RR rdata. */
#define NS_KEY_TYPEMASK     0xC000  /* Mask for "type" bits */
#define NS_KEY_TYPE_AUTH_CONF   0x0000  /* Key usable for both */
#define NS_KEY_TYPE_CONF_ONLY   0x8000  /* Key usable for confidentiality */
#define NS_KEY_TYPE_AUTH_ONLY   0x4000  /* Key usable for authentication */
#define NS_KEY_TYPE_NO_KEY  0xC000  /* No key usable for either; no key */
/* The type bits can also be interpreted independently, as single bits: */
#define NS_KEY_NO_AUTH      0x8000  /* Key unusable for authentication */
#define NS_KEY_NO_CONF      0x4000  /* Key unusable for confidentiality */
#define NS_KEY_RESERVED2    0x2000  /* Security is *mandatory* if bit=0 */
#define NS_KEY_EXTENDED_FLAGS   0x1000  /* reserved - must be zero */
#define NS_KEY_RESERVED4    0x0800  /* reserved - must be zero */
#define NS_KEY_RESERVED5    0x0400  /* reserved - must be zero */
#define NS_KEY_NAME_TYPE    0x0300  /* these bits determine the type */
#define NS_KEY_NAME_USER    0x0000  /* key is assoc. with user */
#define NS_KEY_NAME_ENTITY  0x0200  /* key is assoc. with entity eg host */
#define NS_KEY_NAME_ZONE    0x0100  /* key is zone key */
#define NS_KEY_NAME_RESERVED    0x0300  /* reserved meaning */
#define NS_KEY_RESERVED8    0x0080  /* reserved - must be zero */
#define NS_KEY_RESERVED9    0x0040  /* reserved - must be zero */
#define NS_KEY_RESERVED10   0x0020  /* reserved - must be zero */
#define NS_KEY_RESERVED11   0x0010  /* reserved - must be zero */
#define NS_KEY_SIGNATORYMASK    0x000F  /* key can sign RR's of same name */
#define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
                  NS_KEY_RESERVED4 | \
                  NS_KEY_RESERVED5 | \
                  NS_KEY_RESERVED8 | \
                  NS_KEY_RESERVED9 | \
                  NS_KEY_RESERVED10 | \
                  NS_KEY_RESERVED11 )
#define NS_KEY_RESERVED_BITMASK2 0xFFFF /* no bits defined here */

/* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
#define NS_ALG_MD5RSA       1   /* MD5 with RSA */
#define NS_ALG_DH               2   /* Diffie Hellman KEY */
#define NS_ALG_DSA              3   /* DSA KEY */
#define NS_ALG_DSS              NS_ALG_DSA
#define NS_ALG_EXPIRE_ONLY  253 /* No alg, no security */
#define NS_ALG_PRIVATE_OID  254 /* Key begins with OID giving alg */

/* Protocol values  */
/* value 0 is reserved */
#define NS_KEY_PROT_TLS         1
#define NS_KEY_PROT_EMAIL       2
#define NS_KEY_PROT_DNSSEC      3
#define NS_KEY_PROT_IPSEC       4
#define NS_KEY_PROT_ANY     255

/* Signatures */
#define NS_MD5RSA_MIN_BITS   512    /* Size of a mod or exp in bits */
#define NS_MD5RSA_MAX_BITS  4096
    /* Total of binary mod and exp */
#define NS_MD5RSA_MAX_BYTES ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
    /* Max length of text sig block */
#define NS_MD5RSA_MAX_BASE64    (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
#define NS_MD5RSA_MIN_SIZE  ((NS_MD5RSA_MIN_BITS+7)/8)
#define NS_MD5RSA_MAX_SIZE  ((NS_MD5RSA_MAX_BITS+7)/8)

#define NS_DSA_SIG_SIZE         41
#define NS_DSA_MIN_SIZE         213
#define NS_DSA_MAX_BYTES        405

/* Offsets into SIG record rdata to find various values */
#define NS_SIG_TYPE 0   /* Type flags */
#define NS_SIG_ALG  2   /* Algorithm */
#define NS_SIG_LABELS   3   /* How many labels in name */
#define NS_SIG_OTTL 4   /* Original TTL */
#define NS_SIG_EXPIR    8   /* Expiration time */
#define NS_SIG_SIGNED   12  /* Signature time */
#define NS_SIG_FOOT 16  /* Key footprint */
#define NS_SIG_SIGNER   18  /* Domain name of who signed it */

/* How RR types are represented as bit-flags in NXT records */
#define NS_NXT_BITS 8
#define NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_MAX 127

/*
 * EDNS0 extended flags and option codes, host order.
 */
#define NS_OPT_DNSSEC_OK    0x8000U
#define NS_OPT_NSID             3

/*
 * Inline versions of get/put short/long.  Pointer is advanced.
 */
#define NS_GET16(s, cp) do { \
    const u_char *t_cp = (const u_char *)(cp); \
    (s) = ((uint16_t)t_cp[0] << 8) \
        | ((uint16_t)t_cp[1]) \
        ; \
    (cp) += NS_INT16SZ; \
} while (/*CONSTCOND*/0)

#define NS_GET32(l, cp) do { \
    const u_char *t_cp = (const u_char *)(cp); \
    (l) = ((uint32_t)t_cp[0] << 24) \
        | ((uint32_t)t_cp[1] << 16) \
        | ((uint32_t)t_cp[2] << 8) \
        | ((uint32_t)t_cp[3]) \
        ; \
    (cp) += NS_INT32SZ; \
} while (/*CONSTCOND*/0)

#define NS_PUT16(s, cp) do { \
    uint32_t t_s = (uint32_t)(s); \
    u_char *t_cp = (u_char *)(cp); \
    *t_cp++ = t_s >> 8; \
    *t_cp   = t_s; \
    (cp) += NS_INT16SZ; \
} while (/*CONSTCOND*/0)

#define NS_PUT32(l, cp) do { \
    uint32_t t_l = (uint32_t)(l); \
    u_char *t_cp = (u_char *)(cp); \
    *t_cp++ = t_l >> 24; \
    *t_cp++ = t_l >> 16; \
    *t_cp++ = t_l >> 8; \
    *t_cp   = t_l; \
    (cp) += NS_INT32SZ; \
} while (/*CONSTCOND*/0)

#if !defined(__LP64__)
/* Annoyingly, LP32 shipped with __ names. */
#define ns_msg_getflag      __ns_msg_getflag
#define ns_get16        __ns_get16
#define ns_get32        __ns_get32
#define ns_put16        __ns_put16
#define ns_put32        __ns_put32
#define ns_initparse        __ns_initparse
#define ns_skiprr       __ns_skiprr
#define ns_parserr      __ns_parserr
#define ns_parserr2     __ns_parserr2
#define ns_sprintrr     __ns_sprintrr
#define ns_sprintrrf        __ns_sprintrrf
#define ns_format_ttl       __ns_format_ttl
#define ns_parse_ttl        __ns_parse_ttl
#define ns_datetosecs       __ns_datetosecs
#define ns_name_ntol        __ns_name_ntol
#define ns_name_ntop        __ns_name_ntop
#define ns_name_pton        __ns_name_pton
#define ns_name_pton2       __ns_name_pton2
#define ns_name_unpack      __ns_name_unpack
#define ns_name_unpack2     __ns_name_unpack2
#define ns_name_pack        __ns_name_pack
#define ns_name_compress    __ns_name_compress
#define ns_name_uncompress  __ns_name_uncompress
#define ns_name_skip        __ns_name_skip
#define ns_name_rollback    __ns_name_rollback
#define ns_name_length      __ns_name_length
#define ns_name_eq      __ns_name_eq
#define ns_name_owned       __ns_name_owned
#define ns_name_map     __ns_name_map
#define ns_name_labels      __ns_name_labels
#define ns_sign         __ns_sign
#define ns_sign2        __ns_sign2
#define ns_sign_tcp     __ns_sign_tcp
#define ns_sign_tcp2        __ns_sign_tcp2
#define ns_sign_tcp_init    __ns_sign_tcp_init
#define ns_find_tsig        __ns_find_tsig
#define ns_verify       __ns_verify
#define ns_verify_tcp       __ns_verify_tcp
#define ns_verify_tcp_init  __ns_verify_tcp_init
#define ns_samedomain       __ns_samedomain
#define ns_subdomain        __ns_subdomain
#define ns_makecanon        __ns_makecanon
#define ns_samename     __ns_samename
#endif

__BEGIN_DECLS
int     ns_msg_getflag(ns_msg, int) __LIBC_ABI_PUBLIC__;
uint16_t    ns_get16(const u_char *) __LIBC_ABI_PUBLIC__;
uint32_t    ns_get32(const u_char *) __LIBC_ABI_PUBLIC__;
void        ns_put16(uint16_t, u_char *) __LIBC_ABI_PUBLIC__;
void        ns_put32(uint32_t, u_char *) __LIBC_ABI_PUBLIC__;
int     ns_initparse(const u_char *, int, ns_msg *) __LIBC_ABI_PUBLIC__;
int     ns_skiprr(const u_char *, const u_char *, ns_sect, int) __LIBC_ABI_PUBLIC__;
int     ns_parserr(ns_msg *, ns_sect, int, ns_rr *) __LIBC_ABI_PUBLIC__;
int     ns_parserr2(ns_msg *, ns_sect, int, ns_rr2 *) __LIBC_HIDDEN__;
int     ns_sprintrr(const ns_msg *, const ns_rr *,
                 const char *, const char *, char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_sprintrrf(const u_char *, size_t, const char *,
                  ns_class, ns_type, u_long, const u_char *,
                  size_t, const char *, const char *,
                  char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_format_ttl(u_long, char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_parse_ttl(const char *, u_long *) __LIBC_ABI_PUBLIC__;
uint32_t    ns_datetosecs(const char *cp, int *errp) __LIBC_ABI_PUBLIC__;
int     ns_name_ntol(const u_char *, u_char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_name_ntop(const u_char *, char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_name_pton(const char *, u_char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_name_pton2(const char *, u_char *, size_t, size_t *) __LIBC_HIDDEN__;
int     ns_name_unpack(const u_char *, const u_char *,
                    const u_char *, u_char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_name_unpack2(const u_char *, const u_char *,
                     const u_char *, u_char *, size_t,
                     size_t *) __LIBC_HIDDEN__;
int     ns_name_pack(const u_char *, u_char *, int,
                  const u_char **, const u_char **) __LIBC_ABI_PUBLIC__;
int     ns_name_uncompress(const u_char *, const u_char *,
                    const u_char *, char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_name_compress(const char *, u_char *, size_t,
                      const u_char **, const u_char **) __LIBC_ABI_PUBLIC__;
int     ns_name_skip(const u_char **, const u_char *) __LIBC_ABI_PUBLIC__;
void        ns_name_rollback(const u_char *, const u_char **,
                      const u_char **) __LIBC_ABI_PUBLIC__;
int     ns_sign(u_char *, int *, int, int, void *,
                 const u_char *, int, u_char *, int *, time_t) __LIBC_ABI_PUBLIC__;
int     ns_sign2(u_char *, int *, int, int, void *,
                  const u_char *, int, u_char *, int *, time_t,
                  u_char **, u_char **) __LIBC_ABI_PUBLIC__;
ssize_t     ns_name_length(ns_nname_ct, size_t) __LIBC_HIDDEN__;
int     ns_name_eq(ns_nname_ct, size_t, ns_nname_ct, size_t) __LIBC_HIDDEN__;
int     ns_name_owned(ns_namemap_ct, int, ns_namemap_ct, int) __LIBC_HIDDEN__;
int     ns_name_map(ns_nname_ct, size_t, ns_namemap_t, int) __LIBC_HIDDEN__;
int     ns_name_labels(ns_nname_ct, size_t) __LIBC_HIDDEN__;
int     ns_sign_tcp(u_char *, int *, int, int,
                 ns_tcp_tsig_state *, int) __LIBC_ABI_PUBLIC__;
int     ns_sign_tcp2(u_char *, int *, int, int,
                  ns_tcp_tsig_state *, int,
                  u_char **, u_char **) __LIBC_ABI_PUBLIC__;
int     ns_sign_tcp_init(void *, const u_char *, int,
                    ns_tcp_tsig_state *) __LIBC_ABI_PUBLIC__;
u_char      *ns_find_tsig(u_char *, u_char *) __LIBC_ABI_PUBLIC__;
int     ns_verify(u_char *, int *, void *,
                   const u_char *, int, u_char *, int *,
                   time_t *, int) __LIBC_ABI_PUBLIC__;
int     ns_verify_tcp(u_char *, int *, ns_tcp_tsig_state *, int);
int     ns_verify_tcp_init(void *, const u_char *, int,
                    ns_tcp_tsig_state *) __LIBC_ABI_PUBLIC__;
int     ns_samedomain(const char *, const char *) __LIBC_ABI_PUBLIC__;
int     ns_subdomain(const char *, const char *) __LIBC_ABI_PUBLIC__;
int     ns_makecanon(const char *, char *, size_t) __LIBC_ABI_PUBLIC__;
int     ns_samename(const char *, const char *) __LIBC_ABI_PUBLIC__;
__END_DECLS

#ifdef BIND_4_COMPAT
#include <arpa/nameser_compat.h>
#endif

#endif /* !_ARPA_NAMESER_H_ */
